I am ready to buy either 06 or 07 YZ450F...the reason is my 05 YZ250 2-stroke buzzes and makes my hands tingle and go numb during desert races. I rode a friends 06 and didn't feel any tingle, but I read Yamaha changed the counterbalancer!! If I get the 07, which is what I would prefer, is it now going to buzz? Thanks for any help...I plan on buying Sat. morning!!